Rr320505-advanced-unix-programming

Set No. 1

Code No: RR320505

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the two methods of altering file access permissions of a file. [4+4=8] (b) What are the main functions of kernel? Explain each of them in detail. [3+5] 2. What is meant by a command? Explain different types commands with syntax. [3+13] 3. Explain the following system calls with syntax: (a) chmod() (b) chown() (c) unlink() (d) link()

[4×4=16]

4. Write short notes on the following: (a) Process control (b) Process identifiers.

[8+8]

5. (a) What is signal function? Write and explain about the structure of signal function. [3+5] (b) What is meant by signal catching function? What are the advantages of signal functions. [3+5] 6. (a) What is region lock? What are the rules about the specification of the region to be locked or unlocked? [3+5] (b) Write about file locking versus Record Locking. 7. Explain in detail about the System V IPCs. 8. (a) Explain, How to place “Data in shared memory”.

[8] [16] [8]

(b) What is the use of destroying a shared memory segment? Explain the process of “destroying a shared memory segment”. [3+5] ⋆⋆⋆⋆⋆

1 of 1

Set No. 2

Code No: RR320505

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the two methods of altering file access permissions of a file. [4+4=8] (b) What are the main functions of kernel? Explain each of them in detail. [3+5] 2. Explain the following commands with syntax (a) cat (b) tail (c) head (d) uniq.

[4×4=16]

3. (a) Briefly explain the file directories. (b) Write in detail about Device drivers.

[8+8]

4. Write short notes on the following: (a) Process termination (b) Zombie process.

[8+8]

5. (a) What are the phases in signaling process? Explain what is meant by the lifetime of a signal. [3+5] (b) Explain about the five possible signal default actions.

[8]

6. (a) Explain in detail about the requirement of file locking mechanism. (b) Explain in detail about fcntl( ) function.

[8+8]

7. (a) Explain in detail about file locking with semaphores. (b) Explain about simple semaphore operation.

[8+8]

8. What is shared memory? What is the importance of it? Explain in detail about the process of “Allocating a shared memory segment”. [3+5+8] ⋆⋆⋆⋆⋆

1 of 1

Set No. 3

Code No: RR320505

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the following commands with syntax (a) ftp (b) date (c) arp (d) rlogin.

[4×4=16]

2. What is the purpose of Stream editor? Explain which option should be used to place the contents of a file f1 after line. [4+12] 3. Write a program to a single command-line argument that specifies a file descriptor and prints a description of the file flags for that descriptor. [16] 4. What is the problem with returning an error from the ‘exec’ system call? How can the kernel handle this problem? [8+8] 5. (a) Write in detail about the interrupted system calls. (b) Write about the kill and raise functions.

[8] [4+4]

6. (a) Explain in detail about the requirement of file locking mechanism. (b) Explain in detail about fcntl( ) function.

[8+8]

7. (a) Draw and explain about the “Kernel data structure for a semaphore set”. [8] (b) Write about the semaphore adjustment on “exit”. Explain about the importance of SEM UNDO [4+4] 8. (a) Explain in detail about the “Kernel structure of the shared memory segment”. (b) Explain about the “shmflag values for shmget system call”. ⋆⋆⋆⋆⋆

1 of 1

[8+8]

Set No. 4

Code No: RR320505

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ADVANCED UNIX PROGRAMMING ( Common to Computer Science & Engineering, Information Technology and Computer Science & Systems Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the following commands with syntax (a) ftp (b) date (c) arp (d) rlogin.

[4×4=16]

2. Explain the following commands with syntax (a) awk (b) cpio (c) comm (d) tee.

[4×4=16]

3. Explain the following functions with syntax: (a) ioctl() (b) lseek() (c) stat() (d) fstat()

[4×4=16]

4. Write short notes on the following: (a) Process termination (b) Zombie process.

[8+8]

5. (a) Write about the signals implementation. Write about “sigpending”, “sigsuspend”. (b) What is meant by reinstalling a signal handler? (c) Write about phase function.

[6+5+5]

6. (a) What is region lock? What are the rules about the specification of the region to be locked or unlocked? [3+5] (b) Write about file locking versus Record Locking.

1 of 2

[8]

Set No. 4

Code No: RR320505

7. (a) Explain, “about the events occurred, when you call the popen( ) and pclose( ) functions”? (b) Explain about the semget( ), semctl( ) and semop( ) functions. 8. (a) Explain, “How to control a shared-memory segment”. (b) Explain, “How to attach and detach a shared memory segment”. ⋆⋆⋆⋆⋆

2 of 2

[7+9] [8] [4+4]